OSCILLATOR WITH A LOW POWER CONSUMPTION
A package device, such as an oscillator, includes a package module, a circuit module, a plurality of conductive pins, and a plurality of conductive arms. The package module defines an airtight space therein. The circuit module is disposed in the airtight space in the package module. Each of the conductive pins extends into the airtight space in the package module. Each of the conductive arms is disposed in the airtight space, and has a first end that is connected to the circuit module, a second end that is connected to a respective one of the conductive pins, and an intermediate portion that extends between the first and second ends thereof and that has a length longer than the shortest distance between the first and second ends thereof.
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This application claims priority of Taiwanese application no. 097112994, filed on Apr. 10, 2008.
BACKGROUND OF THE INVENTION1. Field of the Invention
This invention relates to an oscillator, more particularly to a temperature-controlled type oscillator.
2. Description of the Related Art
Crystal oscillators are applied as a reference frequency source not only in wireless communications systems, but also in mobile phones, personal digital assistants (PDA), and notebook computers. A crystal oscillator can be of the well-known quartz crystal oscillator. The resonant frequency of the quartz crystal oscillator, however, varies with temperature. To solve this problem, it has been proposed to use temperature-controlled type oscillators, such as an oven-controlled crystal oscillator (OCXO) or a temperature-compensated crystal oscillator (TCXO).
The aforementioned conventional OCXO 9 is disadvantageous in that, since the heat generated by the heating controller circuit 923 of the circuit module 92 is nevertheless radiated out of the package module 91 through the conductive pins 94, which therefore requires frequent operation of the heating controller circuit 923 of the circuit module 92, the conventional OCXO 9 consumes a large power.
SUMMARY OF THE INVENTIONTherefore, the main object of the present invention is to provide a low-power-consumption package device.
Another object of the present invention is to provide a low-power-consumption oscillator.
According to an aspect of the present invention, a package device comprises a package module, a circuit module, a plurality of conductive pins, and a plurality of conductive arms. The package module includes a cover, and a base that is attached to the cover, and that cooperates with the cover to define an airtight space therebetween. The circuit module is disposed in the airtight space in the package module, and is operable so as to generate heat in order to maintain the airtight space in the package module at an operating temperature. Each of the conductive pins extends into the airtight space in the package module through the base of the package module. Each of the conductive arms is disposed in the airtight space in the package module, and has a first end that is connected to the circuit module, a second end that is connected to a respective one of the conductive pins, and an intermediate portion that extends between the first and second ends thereof and that has a length longer than the shortest distance between the first and second ends thereof.
According to another aspect of the present invention, an oscillator comprises a package module, a circuit module, a plurality of conductive pins, and a plurality of conductive arms. The package module includes a cover, and a base that is attached to the cover, and that cooperates with the cover to define an airtight space therebetween. The circuit module is disposed in the airtight space in the package module, and includes a dielectric substrate, a crystal resonator that is mounted on the dielectric substrate and that is operable at a resonant frequency, and a heating controller circuit that is mounted on the dielectric substrate, and that is operable so as to generate heat in order to maintain the airtight space in the package module at an operating temperature. Each of the conductive pins extends into the airtight space in the package module through the base of the package module. Each of the conductive arms is disposed in the airtight space in the package module, and has a first end that is connected to the dielectric substrate and the crystal resonator of the circuit module, a second end that is connected to a respective one of the conductive pins, and an intermediate portion that extends between the first and second ends thereof and that has a length longer than the shortest distance between the first and second ends thereof.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which:
Referring to
The package device of this embodiment is applied to a temperature-compensated type oscillator.
The package module 3 includes a cover 32, and a base 31 that is attached, such as by seam-sealing technique, to the cover 32, and that cooperates with the cover 32 to define an airtight space 30 therebetween. In this embodiment, each of the cover 32 and the base 31 is made from a metallic material.
The circuit module 2 is disposed in the airtight space 30 in the package module 3, and includes a dielectric substrate 21, a crystal resonator 22, and a heating controller circuit 23. The dielectric substrate 21 has opposite first and second surfaces 211, 212. The crystal resonator 22 is mounted on the first surface 211 of the dielectric substrate 21 and is operable at a resonant frequency. The heating controller circuit 23, which includes a controller chip (not shown), is mounted on the second surface 212 of the dielectric substrate 21, and is operable so as to generate heat in order to maintain the airtight space 30 in the package module 3 at an operating temperature. In this embodiment, the circuit is module 2 is spaced apart from the cover 32 and the base 31 of the package module 3. Moreover, in this embodiment, the heating controller circuit 23 operates based on a user setting and variations of the temperature in the airtight space 30 in the package module 3.
It is noted that the base 31 of the package module 3 has an inner surface that is coated with a gold plating layer (not shown), thereby reducing radiation of the heat generated by the heating controller circuit 23 of the circuit module 2 through the package module 3.
In an alternative embodiment, the crystal resonator 22 is mounted on the second surface 212 of the dielectric substrate 21, and the heating controller circuit 23 is mounted on the first surface 211 of the dielectric substrate 21.
In yet another embodiment, the crystal resonator 22 and the heating controller circuit 23 are mounted on the first surface 211 of the dielectric substrate 21.
In still another embodiment, the crystal resonator 22 and the heating controller circuit 23 are mounted on the second surface 212 of the dielectric substrate 21.
Each of the conductive pins 4 extends through the base 31 of the package module 3, and has a first end portion 41 that is disposed in the airtight space 30 in the package module 3, and a second end portion 42 that is disposed externally of the package module 3.
Each of the conductive arms 1 is disposed in the airtight space 30 in the package module 3, and has a first end 11 that is connected to the dielectric substrate 21 and the crystal resonator 22 of the circuit module 2, a second end 12 that is connected to the first end portion 41 of a respective one of the conductive pins 4, and an intermediate portion 13 that extends between the first and second ends 11, 12 thereof.
With further reference to
While the present invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Claims
1. A package device, comprising:
- a package module including a cover, and a base that is attached to said cover, and that cooperates with said cover to define an airtight space therebetween;
- a circuit module disposed in said airtight space in said package module, and operable so as to generate heat in order to maintain said airtight space in said package module at an operating temperature;
- a plurality of conductive pins, each of which extends into said airtight space in said package module through said base of said package module; and
- a plurality of conductive arms disposed in said airtight space in said package module, each of said conductive arms having a first end that is connected to said circuit module, a second end that is connected to a respective one of said conductive pins, and an intermediate portion that extends between said first and second ends thereof and that has a length longer than the shortest distance between said first and second ends thereof.
2. The package device as claimed in claim 1, wherein said intermediate portion of each of said conductive arms has a meandering shape.
3. The package device as claimed in claim 1, wherein each of said conductive arms is made from a metallic material.
4. The package device as claimed in claim 3, wherein each of said conductive arms has a low heat conductivity.
5. The package device as claimed in claim 1, wherein said circuit module is spaced apart from said cover and said base of said package module.
6. An oscillator, comprising:
- a package module including a cover, and a base that is attached to said cover, and that cooperates with said cover to define an airtight space therebetween;
- a circuit module disposed in said airtight space in said package module, and including a dielectric substrate, a crystal resonator that is mounted on said dielectric substrate and that is operable at a resonant frequency, and a heating controller circuit that is mounted on said dielectric substrate, and that is operable so as to generate heat in order to maintain said airtight space in said package module at an operating temperature;
- a plurality of conductive pins, each of which extends into said airtight space in said package module through said base of said package module; and
- a plurality of conductive arms disposed in said airtight space in said package module, each of said conductive arms having a first end that is connected to said dielectric substrate and said crystal resonator of said circuit module, a second end that is connected to a respective one of said conductive pins, and an intermediate portion that extends between said first and second ends thereof and that has a length longer than the shortest distance between said first and second ends thereof.
7. The oscillator as claimed in claim 6, wherein said intermediate portion of each of said conductive arms has a meandering shape.
8. The oscillator as claimed in claim 6, wherein said dielectric substrate has opposite first and second surfaces, and each of said crystal oscillator and said heating controller circuit is mounted on a respective one of said first and second surfaces of said dielectric substrate.
9. The oscillator as claimed in claim 6, wherein each of said conductive arms is made from a metallic material.
10. The oscillator as claimed in claim 9, wherein each of said conductive arms has a low heat conductivity.
11. The oscillator as claimed in claim 6, wherein said circuit module is spaced apart from said cover and said base of said package module.
12. The oscillator as claimed in claim 6, wherein said oscillator is a temperature-compensated type oscillator.
Type: Application
Filed: Aug 19, 2008
Publication Date: Oct 15, 2009
Patent Grant number: 7825742
Applicant: Taitien Electronics Co., Ltd. (Taipei)
Inventors: Tung-Teh Lee (Taipei), Shih-Neng Huang (Shulin City), Wen-Jung Huang (Shulin City)
Application Number: 12/194,257
International Classification: H03B 1/02 (20060101); G01J 5/00 (20060101);